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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 6 | PAGES 771-781 | 1997
© Oxford University Press

other

Do light quality and low nutrient concentration favour picocyanobacteria below the thermocline of the oligotrophic Lake Stechlin?

Frank Gervais, Judit Padisák1 and Rainer Koschel2

Institute of Freshwater Ecology and Inland Fisheries, Department of Lowland Rivers and Shallow Lakes Müggelseedamm 260, D-12587 Berlin, FRG 1Balaton Limnological Institute of the Hungarian Academy of Science H-8237 Tihany, Hungary 2Institute of Freshwater Ecology and Inland Fisheries, Department of Stratified Lakes Alte Fischerhütte 2, D-16775 Neuglobsow, FRG

Received on October 30, 1996; accepted on February 3, 1997 In May 1995, a short-term study on the vertical distribution of phytoplankton in the holomictic, oligotrophic Lake Stechlin revealed a deep chlorophyll maximum (DCM) due to an increase in phytoplankton biomass below the thermocline. The DCM was dominated by centric diatoms, which probably just passed those water layers while sinking to the sediment, and by picocyanobacteria. The DCM was situated well above the 1% level of photosynthetically active radiation, but received atmost exclusively light of wavelengths between 500 and 600 nm. The dominant picoyanobacteria were pre-adapted to this environment by the possession of phycoerythrin. The competitive advantage of picocyanobacteria compared with other phycoerythrin-containing phototrophs was probably the most efficient nutrient uptake under low nutrient conditions as a consequence of the small size of picoplankton.


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G. L. Perez, C. P. Queimalinos, and B. E. Modenutti
Light climate and plankton in the deep chlorophyll maxima in North Patagonian Andean lakes
J. Plankton Res., June 1, 2002; 24(6): 591 - 599.
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